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DemocratsAreTotallyFucked says
It really is incredible we can breath this stuff. Space aliens might find earth quite toxic.
The Great Oxygenation event over 2 billion years ago was possibly the greatest genocide ever. Any biological base that couldn't survive the poison of oxygen was destroyed - who knows how many alternate biologies were exterminated? That being said, free oxygen allowed much higher metabolic rates, which in turn enabled the development of large animals.
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